Circular-knitting machine.



F. W. ROBINSON.

CIRCULAR KNITTING MACHINE.

APPLICATION mm AUG-4. 1911.

Patented Jim. 14, 1919.

1 l A l I l gmvawko a Reading, in the county of Berks and BIN'SON, OFREADING, PENNSYLVANIA, ASSIU'N'QR TO THE NOLDE & HUT

Ed, Um til: DING, PENNSYLVANIA, A CQRPUATJEON G]? PEEYLV a Ilihlllthi,MAUHE.

' Specification of Letters hatent. Pmtmnp fl dj'mym jjldj flflgApplication illedhugust 1, W17. serial No. rotate.

To all whomjit may concern:

Be it known that 1, FRANK W. ROBINSON, a citizen of the United States,residin-tpt a e of Pennsylvania, have invented certain new and useful,lmprovements in Circular-Knitting Machines, of which the following is aspecification. I

My invention relates to circular knitting machines, and it consistsparticularly in improved means for properly controlling the extra threadcommonly introduced for torming the high-splice and double-foot inseamless hosiery, as fully describedin connection with the accompanyingdrawing andspecifically pointed out in the sub olned claims.

Figure 1 is a fragmentary sectional elevation of a portion of a circularknitting machine having my improvements applied thereto. 1

Fig. 2 is a plan view of the cam block employed.

Fig. 3 is a view looking in the direction 01 the arrow 8 Big. 1, showingthe free ends of the special extra thread carrier finger and an adjacentlowered one, and indicating.

the relative elevated'positions of a long-butt and a short-butt needle.

Fig. i is a developed interior view of the cam block, with needlecourses indicated.

' Fig. 5 is a detail view of the special highspiice thread carrierfinger.

The drawing indicates a needle cylinder 5 oi? the rotary type, providedas usual with two series of vertically guided needles 6 and i, havingrespectively long butts 8 and short butts 9; a relatively fixed camblock 10 to which the needle-operating cams are fixed; and a pluralityof vertically swinging thread carrier fingers 12, 13. Other well knownparts of the machine are omitted-as till unnecessary to the showing ofmy invention.

The cam block 10 is provided with the usual pickers 15, 15, and fixedlyinclined knitting cams 17, 17, cooperating with inclines 18, 19 of theintermediate needle track cam 20 and main track 21, 21. Between theconverging upper portions of the inclined tting cams 17, 17 it providetwo needle lowering cams, one of which, 25, is fixed and adapted toengage and lower the long-butt needles only, while the other, 26, 'ishorirontally movable having an outwardly extendt shank 27 pivoted to theblock at outer end 28 and adapting it to be engaged and swung by theshort butt needles only. The fixed cam has an extension 30 underlyingthe shank 27 of the inwardly project ing movable cam head 26; and thelatter is "adapted to be swung by the contacting short-butt needlesagainst the adjacent inclined knitting cam 17, so as to "provide anextension of such fixed incline for smoothly lowering the short-buttneedles. 'lhis position of the swinging cam, which is assumed inordinary circular knitting, is shown in Fig. 4, where the course of thelong-butt needles is indicated at 35, and ot the short butt needles at36; and it is automatically moved away from said fixed knitting can]. 25during reverse movement of the cylinder in reciprocating knitting, tocooperate with the fixed cam extension 30.

present such special thread. A number otpivotally movable thread carrierfingers as shown at 12, 12 in ordinary form, are commonly employed tothrow determined Ill threads into or out of knitting operation as may berequired for striping, etc.; and my special carrier indicated at 13 isof similar form excepting as to its thread-guiding end. This specialcarrier 13, which remains in operative lowered position during thesplicing operation, is provided with a thread guide portion 39 which isoperatively rigid with the main portion thereof but is capable of beingvaryingly set relative to the latter so as to permit of accuratelypositioning its thread'outlet 40 relative to the thread outlet ace itextends laterally from said portion 88, as

carrier 12. and thus further facilitates the proper cooperativepositioning of the threads irrespective of the swinging movements of thecarriers. 1

What I claim is 1. In a knitting machine comprising a rotary needlecylinder provided with longbutt and short-butt needles and a pluralityof thread carriers; a cam block provided with two top needle-loweringcams, one of which is fixed and adapted to operate on the long-buttneedles only and the other of which is preliminarily moved by impact ofthe short-butt needles only.

.2. In a knitting machine comprising a rotary needle cylinder providedwith longbutt and short-butt needles and a plurality of thread carriers;a cam block provided with two top needle-lowering cams, one of which isfixed and adaptedto operate on the 'long-butt needles only and the otherof cylinder provided with long-butt and shortbutt needles, and a cammechanism comprising fixed and movable needle-lowering cams,

a plurality of swinging thread carriers one of which is provided with athread-guide end portion having a rigidly-settable connection to themain portion ada ted to permit relative positionlng of the t read outletindependently of the bodily swingin movement, said relatively settablethrea guide portion being arranged in the swinging plane of another ofthe carriers.

In testimony whereof I afiix my signature.

FRANK W. ROBINSON.

